Providing S-Lang bindings for the HEALPix C library (https://healpix.sourceforge.io/)
Of course a working C compiler etc. are necessary for the installation.
The S-Lang interpreter (https://www.jedsoft.org/slang/) can make use of this module.
Of course the healpix library is necessary.
I/O routines of the healpix library depend on the cfitsio library (https://heasarc.gsfc.nasa.gov/fitsio/)
The JED editor (https://www.jedsoft.org/jed/) is required to generate the help for the slhealpix package.
An example installation from source could look like this:
autoreconf -i
./configure \
--with-slang=/path/to/slang/installation \
--with-healpix=/path/to/healpix/installation/ \
--with-cfitsio=/path/to/cfitsio/installation/ \
--prefix=/where/to/install/this/module
make
make install